Obviously I'm no instructor, but it looks like you're not hanging off the bike in the slightest. Your head should be trying to kiss the mirror, but at the moment your upper body is more or less central to the bike when you're cornering, it's called being crossed up.
Get one of the instructors to take you out and show you. You'll be dragging your knee by accident after a couple of laps if you do, and the bike will be more upright which means you can accelerate sooner without so much risk of a high side.
Disclaimer: I'm shit